spiral torsion springs

[Mas87]

Anyone know of any suitable instrumentation or have any ideas on how to measure the amount of energy that can be stored on the attached spring?

The spring can be unsrewed and mounted on something if needs be.

Any equations to calculate the amount of energy that can be stored would also be helpful.

Thanks.

 

[israelkk]

E = 0.5 * K *(Theta)^2

E - Energy (Joule)
K - Spring constant (N-m/radians)
Theta - Angle of deflection (Radians)

You can use the formula with other unit system as long as it is consistent.

 

[telecomguy]

Here's an online design guide:

http://www.kanthal.com/sandvik/0140...6bdb0045905d/$FILE/Spring Designer Guide .pdf

<tg>

 

[telecomguy]

Sorry about that discombobulated link. Here's another source of the document:

http://www2.sandvik.com/sandvik/014...49a083efbf29339185256bdb0045905d!OpenDocument

<tg>

 

[Mas87]

Thanks both.

Is there a formula for how many times it can be wound (number of revolutions) it can take?

 

[telecomguy]

If I understand what you are asking, that's going to be based on the center coil diameter, spring thickness, & spring length. You'll just sum up the circumferences of the concentric coils. Cn = pi (D + n*2t); where Cn is the circumference of the nth coil, D is the center coil diameter & t is the thickness. The sum of Cn from 1 to n is the length of the spring.

<tg>

 

[israelkk]

Mas87

You need to calculate the stresses in the spring and then use fatique analysis (S-N, Goodman, etc.) to calculate the life cycle. There is no one simple formula for this process.

Your first post asked about energy now are talking stresses and loads.